thermal balance test of solar orbiter eui instrument ... · thermal balance test of solar orbiter...
Post on 30-Mar-2021
6 Views
Preview:
TRANSCRIPT
Thermal balance test of Solar Orbiter EUI instrument Structural and Thermal Model
with 13 Solar constants
L. Jacques, J.-P. Halain, L. Rossi, M.-L. Hellin, P. Jamotton, S. Liebecq, A. Mazzoli, E. Renotte, P. Rochus
Centre Spatial de Liège, University of Liège, Belgium
Spacecraft Thermal Control Workshop, The Aerospace Corporation, El Segundo, March 26th, 2015
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 2
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 3
slide 4
Space Center in Liège, Belgium
University of Liège Research Center (since 1959)
Test facility for ESA:– Class 10000 & class 100 cleanrooms– 5 Vacuum chambers with optical bench (1.5 to
6.5m Ø)– 2 shakers in cleanroom (also cryo-vib)– Planck S/C, Herschel mirror, GAIA (PLM), XMM
telescope,…
Space instruments developed at CSL
EIT (SOHO), OM (XMM), FUV/SI (IMAGE), Sun baffle (C oRoT), HI (STEREO), PACS grating & DEC/MEC (Herschel), MIRI ( JWST), UVS SMA (JUNO), SWAP & LYRA (PROBA-2), EUI (Solar Orbiter) , ASPCIIS (PROBA-3),…
slide 5
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 6
Solar Orbiter key figures
� ESA M-Class mission� S/C currently in CDR� Oct-2018 launch� 0.28AU perihelion (17.5kW/m²), 1.47AU aphelion� 6 remote sensing instruments� 4 in-situ instruments� ~1800kg S/C (~190kg payload)� ~1kW� 400mm thick heat shield
slide 7
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 8
The Extreme-Ultraviolet Imager
� Remote sensing instrument with 3 channels� 2 High Resolution Imagers (100km resol.)
– HRILya at Lyman- α line (1216Å)– HRIEUV at 174Å
� 1 dual-band Full Sun Imager at 174Å and 304Å (900km resol.)
slide 9
FSI channel
HRILya channel
HRIEUV channel
HRIEUV entrance baffle
HRILya entrance baffle
FSI entrance baffle
HRIs Focal Plane Assembly
FSI Focal Plane Assembly(detector + Front End Electronics) FSI filter wheel
FSI primary mirror
HRIs primary mirror
HRIs secondary mirror
HRIEUV filter wheel
EUI in a nutshell
� 860 x 450 x 360 mm, ~15kg, 28W� CFRP-Alu honeycomb-CFRP sandwich structure� Ultrathin HRI EUV & FSI entrance filters (150nm thick Al.)� MgF2 coated HRI Lya entrance filter� Al. coated CFRP entrance baffles� Heat-pipes to cool down entrance filters, baffles a nd doors� -40°C cooled detectors (Al. Nitride package)
slide 10
S/C thermal interfaces
slide 11
S/C -y panel(conductive environment)
S/C Heat Shield
S/C heat shieldFeedthrough
Honeycomb bench
HRI FPAs
FEEdetector
HE CEHRIs MEHRIs
HRIs entrance baffle, door, filter assembly
FSI FPA
CEFSI MEFSI
Radiativeenvironment
QS
QB
FEEdetector
HE: Hot Element interface (+50°C)CE: Cold Element Interface (-50°C)ME: Medium Element Interface (+20°C)QB: IR load from S/C heat shield feedthroughs at ~300°CQS: Solar heat flux (17.5kW/m² at 0.28AU)TR: S/C cavity radiative environment (+50°C)TSRP: S/C conductive environment (+50°C)
HRIs heat pipes
� Conducts heat from HRIs filters, baffles & doors to HE� Two redundant heat-pipes� Al-NH3 heat pipes with H -shaped copper brazed interfaces� Copper goggles connecting doors, baffles, filters t o HP� Instrument orientation in TB test (also at S/C leve l)
slide 12
Ultrathin HRIEUV entrance filter
� 108 rejection of visible part of Solar spectrum
� Twice reinforced for structural & thermal– Local Nickel mesh grown onto Al foil– Clamped between Al. frames
slide 13
Ni mesh
Frame cell
Aluminium frame
2mm thickAluminiumframe
~30µm thick Ni meshFramepatternmatching
150nm thick Aluminium foil
Detector & Focal Plane Assembly
� 3k x 3k Active Pixel Sensor (developed for EUI)� Aluminum nitride package (T ° uniformity + CTE matching)� 3 Ti blades support (0.4mm thick for thermal decoup ling)
slide 14
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 15
Thermal balance test setup overview
slide 16
� Instrument STM upside-down� 3 Xe lamps� 3 feedthroughs� 220 sensors
Illumination setup
� 3 elliptical Cermax Xe arc-lamp + parabolic folding m irror
� Lamp spectrum + mirror spectral reflectivity
� Instrument coating absorptance adjusted
slide 17
400 600 800 1000 1200 1400 1600 1800 20000
0.5
1
Wavelength [nm]
rela
tive
spec
tral
inte
nsity
[A
U]
400 600 800 1000 1200 1400 1600 1800 20000
50
100
Wavelength [nm]
Inte
grat
ed in
tens
ity [
%]
∫ECermax(λ)dλ
∫ESun(λ)dλ
Illumination setup callibration
� Profile measured with picture & photodiode mapping
� Intensity measured with pyranometer
slide 18
17.5kW/m² @ 1.5m
slide 19
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 25
10
15
20
25
30
35
40
Irra
dian
ce [
kW/m
²]
Distribution over a 50mm diam area
Avg
MaxMin
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 25
6
7
8
9
10
distance from mirror [m]
Non
uni
form
ity w
rt a
vera
ge [
%]
(Max-Avg)/Avg
(Avg-Min)/Avg
Distance from folding mirror [m]
Distance from folding mirror [m]
17.5
Irradiance [kW/m²]
Non-uniformityover 50mm Ø area [%]
Divergence from pinhole spot size
slide 20
0 50 100 150 200 250 300 350 4000
50
100
150
200
250
300
350
50mm
50 100 150 200 250
10 20 30 40 50 60 700
0.2
0.4
0.6
0.8
1
X: 35.63Y: 0.278
x [mm]
X: 41.8Y: 0.2815
M1��
Array of pinholes
screen��
�
��
penumbra
��
�
� � atan�
2�� atan
�� � ��
2�� 1.4
��.�
��.�deg
Thermal IF setup
slide 21
LN2 panel + straps with heaters to provideCE, ME & HE temperatures
S/C cavity conductive environment
S/C heat shieldrepresentative feedthrough (hot & cold)with ceramic heaters & LN2 lines
Xe lamps
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 22
Test sequence & results overview
slide 23
01/09 01/10 01/11 01/12 01/13 01/14-200
-100
0
100
200
300
400
500
Time
Te
mp
era
ture
[°C
]
Baffle_EUV_front_-Y
THERMAL_IF_PANEL_1
Feedthrough_EUV_heater1_north
FPA_FSI_APS_1
08-Jan-2014 12:00:00 14-Jan-2014 00:00:00
close vacuum chamber and pumping
Thermal shroud PID tuning
Start hot case- 1 Fuse broke up- 1 S/C Heater lost
Switch ON lamps to 17.5kW/m²
Switch to LN2 on radiator and wait stabilization
- ≠ OP cases- Rotation of the
instrument:Heat pipe stall
- Hot NOP case- 3SC case- Start cold OP case
- ≠ OP cases- Start cold NOP
case
Back to ambient P and T
HRIEUV entrance baffle
Thermal IF panel
HRIEUV feedthroughFSI detector
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 24
Thermal model description
� Semi-transparent screen to model lamp flux non-uniformity
� Actual divergence � Actual absorption� 5219 nodes
slide 25
HRILya flux
Solar transmissivity
0
0.65
HRIEUV flux
Thermal model correlation
� RMS error (93 sensors): 1.2K (4.8K before correlati on)
� Error max: 2.8K
� Hot OP case results:
slide 26
Temperature [°C]
88
45
63
55
75
-50
200
60
Test heat balance
� 14.0W environment input, 10W dissipation
slide 27
QSRP = 0.0 W
QS [W] QB [W]
pupil 1.0
baffle 1.0 7.7 W VIS
filter 3.4 1.0 W IR QR = 3.9 W
door housing 2.3
QI
10.0 W
pupil 0.7
baffle 0.4 3.7 W VIS QCE,HRIs = 4.8 W
filter 1.7 0.5 W IR
door housing 0.9 QS+QB Q TOT14.0 W 24.0 W
pupil 0.4
baffle 0.0 0.5 W VIS
filter 0.0 0.0 W IR QME,HRIs = 2.9 W
door housing 0.0
Stru (goggles) & MLI 0.3 0.3 0.6 W
Total 12.1 W + 1.8 W = 14.0 W
QHE = 8.7 W
1.0HRI EUV 8.7 W
QME,FSI = 1.4 W
HRI Lya 4.2 W
QCE,FSI = 2.3 W
FSI 0.5 W0.0
0.5
IN OUT
Outline
� What we do at CSL?
� Solar Orbiter
� EUI
� Test setup presentation
� Test results
� Test correlation
� Conclusions
slide 28
Conclusions
� Model correlated
� Ultrathin filters survived
� Hot & cold thermo-elastic measurement performed & correlated
� Lessons learned for QM and FM thermal tests
� Further unit dedicated test:– Focal plane assemblies QM– Doors QM
slide 29
Thank you for your attention…
any question?
slide 30
Contact
Lionel Jacques, ljacques@ulg.ac.beThermal Engineer & PhD student
� Centre Spatial de Liège Liège Science Park Avenue Pré-AilyB-4031 Angleur Belgium http://www.csl.ulg.ac.be
� University of LiègeSpace Structures and Systems Lab1, Chemin des Chevreuils (B52/3)Liege, B-4000, Belgiumhttp://www.ltas-s3l.ulg.ac.be/
slide 31Spacecraft Thermal Control Workshop, The Aerospace Corporation, El Segundo, March 26th, 2015
top related